EP3522272A1 - Kathodenaktivmaterial für eine lithiumsekundärbatterie, herstellungsverfahren dafür und lithiumsekundärbatterie damit - Google Patents

Kathodenaktivmaterial für eine lithiumsekundärbatterie, herstellungsverfahren dafür und lithiumsekundärbatterie damit Download PDF

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EP3522272A1
EP3522272A1 EP18760273.5A EP18760273A EP3522272A1 EP 3522272 A1 EP3522272 A1 EP 3522272A1 EP 18760273 A EP18760273 A EP 18760273A EP 3522272 A1 EP3522272 A1 EP 3522272A1
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positive electrode
lithium
active material
electrode active
transition metal
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French (fr)
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EP3522272A4 (de
EP3522272B1 (de
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Ji Hye Kim
Byung Chun Park
So Ra Baek
Tae Gu YOO
Wang Mo Jung
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LG Energy Solution Ltd
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LG Chem Ltd
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Priority claimed from PCT/KR2018/002505 external-priority patent/WO2018160023A1/ko
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    • H01M4/525—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
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    • C01G53/40—Complex oxides containing nickel and at least one other metal element
    • C01G53/42—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2
    • C01G53/44—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2 containing manganese
    • C01G53/50—Complex oxides containing nickel and at least one other metal element containing alkali metals, e.g. LiNiO2 containing manganese of the type (MnO2)n-, e.g. Li(NixMn1-x)O2 or Li(MyNixMn1-x-y)O2
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    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
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    • H01M4/362—Composites
    • H01M4/364—Composites as mixtures
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    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/485—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy
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    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H01M4/50—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese
    • H01M4/505—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
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    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M2004/8678—Inert electrodes with catalytic activity, e.g. for fuel cells characterised by the polarity
    • H01M2004/8689—Positive electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E60/30—Hydrogen technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present invention relates to a positive electrode active material for a lithium secondary battery, a method of preparing the same, and a lithium secondary battery including the positive electrode active material.
  • lithium secondary batteries having high energy density, high voltage, long cycle life, and low self-discharging rate have been commercialized and widely used.
  • Lithium transition metal composite oxides have been used as a positive electrode active material of the lithium secondary battery, and, among these oxides, a lithium cobalt composite metal oxide of LiCoO 2 having a high operating voltage and excellent capacity characteristics has been mainly used.
  • a lithium cobalt composite metal oxide of LiCoO 2 having a high operating voltage and excellent capacity characteristics has been mainly used.
  • the LiCoO 2 has very poor thermal properties due to an unstable crystal structure caused by lithium deintercalation and is expensive, there is a limitation in using a large amount of the LiCoO 2 as a power source for applications such as electric vehicles.
  • Lithium manganese composite metal oxides LiMnO 2 or LiMn 2 O 4
  • lithium iron phosphate compounds LiFePO 4 , etc.
  • lithium nickel composite metal oxides LiNiO 2 , etc.
  • research and development of the lithium nickel composite metal oxides in which a large capacity battery may be easily achieved due to a high reversible capacity of about 200 mAh/g, have been more actively conducted.
  • the LiNiO 2 has limitations in that the LiNiO 2 has poorer thermal stability than the LiCoO 2 and, when an internal short circuit occurs in a charged state due to an external pressure, the positive electrode active material itself is decomposed to cause rupture and ignition of the battery.
  • NCM-based lithium oxide nickel cobalt manganese-based lithium composite metal oxide
  • An aspect of the present invention provides a positive electrode active material for a lithium secondary battery, in which excellent capacity characteristics, life characteristics, resistance characteristics, and high-temperature stability may be achieved by suppressing a rapid increase in crystallite size even at a high sintering temperature, improving crystallinity, and reducing a residual amount of lithium byproduct, a method of preparing the same, and a lithium secondary battery including the positive electrode active material.
  • a positive electrode active material for a lithium secondary battery which includes a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), wherein a portion of nickel (Ni) sites of the lithium composite transition metal oxide is substituted with tungsten (W), and an amount of a lithium tungsten oxide remaining on surfaces of lithium composite transition metal oxide particles is 1,000 ppm or less.
  • a method of preparing a positive electrode active material for a lithium secondary battery which includes preparing a metal solution including a nickel (Ni)-containing raw material, a cobalt (Co)-containing raw material, a manganese (Mn)-containing raw material, and a tungsten (W)-containing raw material; preparing a positive electrode active material precursor by a co-precipitation reaction of the metal solution; mixing and sintering the positive electrode active material precursor and a lithium raw material to prepare a lithium composite transition metal oxide in which a portion of nickel (Ni) sites is substituted with tungsten (W); and washing the sintered lithium composite transition metal oxide to remove a lithium tungsten oxide remaining on a surface of the lithium composite transition metal oxide.
  • a positive electrode and a lithium secondary battery which include the positive electrode active material.
  • a crystallite size may be reduced while increasing a particle diameter of the positive electrode active material, and, accordingly, high capacity may be achieved, resistance may be improved, and life characteristics and high-temperature stability may be secured.
  • a positive electrode active material for a lithium secondary battery of the present invention includes a lithium composite transition metal oxide including nickel (Ni), cobalt (Co), and manganese (Mn), wherein a portion of nickel (Ni) sites of the lithium composite transition metal oxide is substituted with tungsten (W), and an amount of a lithium tungsten oxide remaining on surfaces of lithium composite transition metal oxide particles is 1,000 ppm or less.
  • a residual amount of lithium byproduct on the surface of the positive electrode active material is increased as the amount of the nickel (Ni) in the positive electrode active material is increased, wherein capacity of the battery may also be reduced by the lithium byproduct.
  • a portion of nickel (Ni) sites of the lithium composite transition metal oxide is substituted with tungsten (W) by doping the tungsten (W) through a co-precipitation reaction, an amount of a lithium byproduct, particularly, a lithium tungsten oxide remaining on surfaces of lithium composite transition metal oxide particles is reduced through a washing process after sintering, and, as a result, high capacity may be achieved, resistance may be improved, and life characteristics and high-temperature stability may be secured.
  • the positive electrode active material for a lithium secondary battery of the present invention is mainly characterized in that the portion of the nickel (Ni) sites of the lithium composite transition metal oxide is substituted with tungsten (W).
  • the portion of the nickel (Ni) sites, which are in a crystal structure of the lithium composite transition metal oxide, is substituted with tungsten (W) in comparison to a case in which a surface side, which is outside the crystal structure, is doped with tungsten (W), a rapid increase in crystallite size may be more effectively suppressed even when a sintering temperature is increased to prepare a positive electrode active material having a large particle diameter, a reduction of crystallinity may be prevented, and effects of achieving high capacity and improving resistance may be improved.
  • the lithium composite transition metal oxide may be represented by Formula 1 below.
  • Formula 1 Li a Ni 1-x1-y1-z1 W z1 Co x1 M 1 y1 M 2 q1 O 2
  • M 1 may include at least one selected from the group consisting of manganese (Mn) and aluminum (Al)
  • M 2 may include at least one selected from the group consisting of barium (Ba), calcium (Ca), zirconium (Zr), titanium (Ti), magnesium (Mg), tantalum (Ta), niobium (Nb), and molybdenum (Mo).
  • the lithium composite transition metal oxide used in the present invention may essentially include four components of nickel (Ni), cobalt (Co), manganese (Mn), and aluminum (Al), and may be a lithium composite transition metal oxide in which a portion of the nickel (Ni) sites is substituted with tungsten (W). Also, the lithium composite transition metal oxide of the present invention may be a lithium composite transition metal oxide in which nickel (Ni), cobalt (Co), and manganese (Mn) are included, the portion of the nickel (Ni) sites is substituted with tungsten (W), and at least one selected from the group consisting of Ba, Ca, Zr, Ti, Mg, Ta, Nb, and Mo is further included outside the crystal structure.
  • the lithium composite transition metal oxide used in the present invention may be a lithium composite transition metal oxide in which 0 ⁇ x1+y1+z1 ⁇ 0.2 is satisfied in Formula 1. That is, the lithium composite transition metal oxide used in the present invention may be a high nickel-based lithium composite transition metal oxide in which a molar ratio of nickel (Ni) in a total molar ratio of transition metals in the lithium composite transition metal oxide is 0.8 or more.
  • lithium (Li) may be included in an amount corresponding to a, that is, 1.0 ⁇ a ⁇ 1.5.
  • a is less than 1.0, there is a concern that capacity may be reduced, and, when a is greater than 1.5, since the particles are sintered during the sintering process, the preparation of the positive electrode active material may be difficult.
  • the Li for example, may be included in an amount satisfying 1.0 ⁇ a ⁇ 1.15, in consideration of balance between a significant capacity characteristics improvement effect due to the control of the amount of the Li and sinterability during the preparation of the active material.
  • Ni may be included in an amount corresponding to 1-x1-y1-z1, i.e., 0.8 ⁇ 1-x1-y1-z1 ⁇ 1.
  • Ni may be included in an amount satisfying 0.8 ⁇ 1-x1-y1-z1 ⁇ 0.9.
  • the amount of the Ni is less than 0.8, there may be a limitation in achieving high capacity, and, when the amount of the Ni is greater than 0.9, since an amount of Li, which is sufficient for contributing to the charge and discharge, may not be secured due to the substitution of a portion of Li sites with Ni, charge and discharge capacity may be reduced.
  • Co may be included in an amount corresponding to x1, that is, 0 ⁇ x1 ⁇ 0.2.
  • the amount of Co in the lithium composite transition metal oxide of Formula 1 is greater than 0.2, efficiency of improving capacity characteristics may be reduced in comparison to a cost increase.
  • the Co for example, may be included in an amount satisfying 0.05 ⁇ x ⁇ 0.2, in consideration of the significant capacity characteristics improvement effect due to the inclusion of the Co.
  • elements of Ni and Co in the lithium composite transition metal oxide of Formula 1 may be partially substituted or doped with metallic element M 1 to improve structural stability of the positive electrode active material.
  • the M 1 may include at least one selected from the group consisting of Mn and Al.
  • the metallic element M 1 may be included in an amount corresponding to y1, that is, 0 ⁇ y1 ⁇ 0.2, in consideration of structural stability improvement effect due to the inclusion of the Mn and/or Al and the resulting effect of improving stability and life characteristics of the battery. In a case in which y1 in the lithium composite transition metal oxide of Formula 1 is greater than 0.2, there is a concern that output characteristics and capacity characteristics of the battery may be reduced.
  • W may be included in an amount corresponding to z1, that is, 0 ⁇ z1 ⁇ 0.2.
  • the crystallite size may be increased, the crystallinity may be reduced, and the resistance may be increased.
  • z1 is greater than 0.2, since the dissolution of W occurs, there may be limitations such as a reduction in capacity and an increase in resistance during high-temperature storage and gas generation.
  • the W may specifically be included in an amount satisfying 0.0005 ⁇ z1 ⁇ 0.1. In this case, it means that the above amount of the W is substituted into the Ni sites in the crystal structure.
  • the lithium composite transition metal oxide of Formula 1 may be doped with another element, that is, M 2 , in addition to the elements of Ni, Co, W, and M 1 , to improve battery characteristics by controlling the distribution of the transition metal elements in the positive electrode active material.
  • the M 2 may include at least one selected from the group consisting of Ba, Ca, Zr, Ti, Mg, Ta, Nb, and Mo.
  • the element of M 2 may be included in an amount corresponding to q1 within a range in which characteristics of the positive electrode are not degraded, that is, 0 ⁇ q1 ⁇ 0.1.
  • the lithium composite transition metal oxide may contain tungsten (W) in an amount of 10 ppm to 5,000 ppm in the crystal structure, may more preferably contain tungsten (W) in an amount of 1,000 ppm to 3,500 ppm in the crystal structure, and may most preferably contain tungsten (W) in an amount of 2,000 ppm to 3,000 ppm in the crystal structure.
  • W tungsten
  • the amount of the tungsten (W) in the crystal structure of the lithium composite transition metal oxide is less than 10 ppm, the control of the crystallite size is difficult, and, particularly, with respect to an active material having a high Ni content and a large particle diameter, since its crystallite size is rapidly increased, resistance may be increased and capacity may be reduced.
  • the amount of the tungsten (W) in the crystal structure is greater than 5,000 ppm, there may be limitations such as the reduction in capacity and the increase in resistance due to the dissolution of the W and the gas generation.
  • the amount of the tungsten (W) in the crystal structure may most preferably be in a range of 2,000 ppm to 3,000 ppm, in consideration of the effects of improving capacity characteristics, resistance characteristics, and high-temperature stability of the lithium composite transition metal oxide.
  • d/1,000 c may be in a range of 0.05 or more, more preferably 0.06 to 0.10, and most preferably 0.06 to 0.095.
  • the lithium composite transition metal oxide positive electrode active material according to an embodiment of the present invention suppresses a rapid increase in the crystallite size while increasing the particle diameter to increase the energy density, and thus, high capacity may be achieved.
  • the crystallinity may be reduced, the crystallite size may be rapidly increased, and the d/1,000 c may be less than 0.05.
  • the d/1,000 c is less than 0.05, it is difficult to achieve the normal capacity, and an initial resistance value and the resistance may be increased.
  • the average particle diameters (D 50 ) may be defined as a particle diameter at a cumulative volume of 50% in a particle size distribution curve.
  • the average particle diameters (D 50 ), for example, may be measured using a particle size distribution.
  • a method of measuring the average particle diameter (D 50 ) of the positive electrode active material after particles of the positive electrode active material are dispersed in a dispersion medium, the dispersion medium is introduced into a commercial laser diffraction particle size measurement instrument (e.g., Microtrac MT 3000) and irradiated with ultrasonic waves having a frequency of about 28 kHz and an output of 60 W, and the average particle diameter (D 50 ) at the cumulative volume of 50% may then be calculated by the measurement instrument.
  • a commercial laser diffraction particle size measurement instrument e.g., Microtrac MT 3000
  • the crystallite size may be defined as a single domain with an orientation in a primary particle, and the crystallite size may be calculated from x-ray diffraction (XRD) measurement values.
  • XRD x-ray diffraction
  • the crystallite size of the lithium composite transition metal oxide may be in a range of 100 nm to 200 nm, more preferably 130 nm to 180 nm, and most preferably 140 nm to 160 nm.
  • a rapid increase in the crystallite size may be prevented during sintering at high temperature even if a high amount of nickel (Ni) is particularly included, and the control of the crystallite size may be facilitated.
  • the crystallite size of the lithium composite transition metal oxide is less than 100 nm, since the crystallinity is low, storability may be rapidly deteriorated at high temperature, gas generation may be increased due to a side reaction with an electrolyte solution caused by a high specific surface area, or stability of the positive electrode active material may be degraded due to structural instability of the positive electrode active material. In a case in which the crystallite size of the lithium composite transition metal oxide is greater than 200 nm, the capacity and life characteristics may be significantly reduced.
  • the average particle diameter (D 50 ) of the positive electrode active material according to the embodiment of the present invention may be in a range of 3 ⁇ m to 50 ⁇ m, more preferably 7 ⁇ m to 20 ⁇ m, and most preferably 14 ⁇ m to 18 ⁇ m.
  • the positive electrode active material according to another embodiment of the present invention may have an average particle diameter (D 50 ) of 3 ⁇ m to 6 ⁇ m and a ⁇ (D 90 -D 10 )/D 50 ⁇ of 0.6 or less.
  • the lithium composite transition metal oxide positive electrode active material of the present invention may have an amount of lithium tungsten oxide remaining on the particle surfaces of 1,000 ppm or less, more preferably 100 ppm to 700 ppm, and most preferably 500 ppm or less.
  • the residual amount of the lithium byproduct on the surface of the positive electrode active material is increased, wherein, since water-soluble tungsten (W) present as the lithium tungsten oxide on the surface of the lithium composite transition metal oxide is removed by washing, the amount of the residual lithium tungsten oxide may be adjusted to 1,000 ppm or less. In a case in which the amount of the residual lithium tungsten oxide is greater than 1,000 ppm, a reduction in capacity, gas generation, and a swelling phenomenon may occur, and the high-temperature stability may be reduced.
  • a method of preparing a positive electrode active material for a lithium secondary battery of the present invention includes: preparing a metal solution including a nickel (Ni)-containing raw material, a cobalt (Co)-containing raw material, a manganese (Mn)-containing raw material, and a tungsten (W)-containing raw material; preparing a positive electrode active material precursor by a co-precipitation reaction of the metal solution; mixing and sintering the positive electrode active material precursor and a lithium raw material to prepare a lithium composite transition metal oxide in which a portion of nickel (Ni) sites is substituted with tungsten (W); and washing the sintered lithium composite transition metal oxide to remove a lithium tungsten oxide remaining on a surface of the lithium composite transition metal oxide.
  • the tungsten (W)-containing raw material is dissolved in the metal solution, and a positive electrode active material precursor is prepared by a co-precipitation reaction.
  • the nickel (Ni)-containing raw material may include nickel-containing acetic acid salts, nitrates, sulfates, halides, sulfides, hydroxides, oxides, or oxyhydroxides, and may specifically include Ni(OH) 2 , NiO, NiOOH, NiCO 3 ⁇ 2Ni(OH) 2 ⁇ 4H 2 O, NiC 2 O 2 ⁇ 2H 2 O, Ni(NO 3 ) 2 ⁇ 6H 2 O, NiSO 4 , NiSO 4 ⁇ 6H 2 O, a fatty acid nickel salt, a nickel halide, or a combination thereof, but the present invention is not limited thereto.
  • the cobalt (Co)-containing raw material may include cobalt-containing acetic acid salts, nitrates, sulfates, halides, sulfides, hydroxides, oxides, or oxyhydroxides, and may specifically include as Co(OH) 2 , CoOOH, Co(OCOCH 3 ) 2 ⁇ 4H 2 O, Co(NO 3 ) 2 ⁇ 6H 2 O, Co(SO 4 ) 2 ⁇ 7H 2 O, or a combination thereof, but the present invention is not limited thereto.
  • the manganese (Mn)-containing raw material may include manganese-containing acetic acid salts, nitrates, sulfates, halides, sulfides, hydroxides, oxides, oxyhydroxides, or a combination thereof, and may specifically include a manganese oxide such as Mn 2 O 3 , MnO 2 , and Mn 3 O 4 ; a manganese salt such as MnCO 3 , Mn(NO 3 ) 2 , MnSO 4 , manganese acetate, manganese dicarboxylate, manganese citrate, and a fatty acid manganese salt; a manganese oxyhydroxide, manganese chloride, or a combination thereof, but the present invention is not limited thereto.
  • the tungsten (W)-containing raw material may include tungsten-containing acetic acid salts, nitrates, sulfates, halides, sulfides, hydroxides, oxides, oxyhydroxides, or a combination thereof, and may specifically include sodium tungstate (Na 2 WO 4 ), tungsten oxide (WO 3 ), tungstic acid (H 2 WO 4 ), or a combination thereof, but the present invention is not limited thereto.
  • the metal solution may further include an aluminum (Al)-containing raw material, and, for example, the aluminum (Al)-containing raw material may include aluminum-containing acetic acid salts, nitrates, sulfates, halides, sulfides, hydroxides, oxides, oxyhydroxides, or a combination thereof, and may specifically include AlSO 4 , AlCl 3 , Al-isopropoxide, AlNO 3 , or a combination thereof, but the present invention is not limited thereto.
  • the metal solution may be prepared by adding the nickel (Ni)-containing raw material, the cobalt (Co)-containing raw material, the manganese (Mn)-containing raw material, and the tungsten (W)-containing raw material to a solvent, specifically water, or a mixture of water and an organic solvent (e.g., alcohol etc.) which may be uniformly mixed with the water, or may be prepared by mixing aqueous solutions of the nickel (Ni)-containing raw material, the cobalt (Co)-containing raw material, the manganese (Mn)-containing raw material, and the tungsten (W)-containing raw material.
  • a solvent specifically water, or a mixture of water and an organic solvent (e.g., alcohol etc.
  • the metal solution may include the tungsten (W)-containing raw material in an amount of 0.01 mol% to 1.0 mol%, more preferably 0.01 mol% to 0.8 mol%, and most preferably 0.05 mol% to 0.5 mol% based on a total of the nickel (Ni)-containing raw material, the cobalt (Co)-containing raw material, the manganese (Mn)-containing raw material, and the tungsten (W)-containing raw material.
  • the positive electrode active material precursor may be prepared by a co-precipitation reaction by adding an ammonium cation-containing complexing agent and a basic compound to the metal solution.
  • the ammonium cation-containing complexing agent may include NH 4 OH, (NH 4 ) 2 SO 4 , NH 4 NO 3 , NH 4 Cl, CH 3 COONH 4 , NH 4 CO 3 , or a combination thereof, but the present invention is not limited thereto.
  • the ammonium cation-containing complexing agent may be used in the form of an aqueous solution, and, in this case, water or a mixture of water and an organic solvent (specifically, alcohol etc.), which may be uniformly mixed with the water, may be used as a solvent.
  • the basic compound may include a hydroxide of alkali metal or alkaline earth metal, such as NaOH, KOH, or Ca(OH) 2 , a hydrate thereof, or a combination thereof.
  • the basic compound may also be used in the form of an aqueous solution, and, in this case, water or a mixture of water and an organic solvent (specifically, alcohol etc.), which may be uniformly mixed with the water, may be used as a solvent.
  • the basic compound is added to adjust a pH of the reaction solution, wherein the basic compound may be added in an amount such that the pH of the metal solution is 11 to 13.
  • the co-precipitation reaction may be performed in a temperature range of 40°C to 70°C in an inert atmosphere such as nitrogen or argon.
  • the positive electrode active material precursor thus prepared may be represented by Formula 2 below.
  • M 1 may include at least one selected from the group consisting of Mn and Al.
  • the positive electrode active material precursor prepared in the present invention may be a high nickel-based positive electrode active material precursor in which 0 ⁇ x2+y2+z2 ⁇ 0.2 is satisfied in Formula 2, that is, a molar ratio of nickel (Ni) in a total molar ratio of the transition metals is 0.8 or more.
  • amounts of Ni, Co, Mn, and W may be equally used as in the above-described lithium composite transition metal oxide positive electrode active material.
  • the positive electrode active material precursor and the lithium-containing raw material are mixed and sintered to prepare a lithium composite transition metal oxide in which a portion of the nickel (Ni) sites is substituted with tungsten (W).
  • the lithium-containing raw material may include a lithium-containing carbonate (e.g., lithium carbonate etc.), hydrate (e.g., lithium hydroxide monohydrate (LiOH ⁇ H 2 O) etc.), hydroxide (e.g., lithium hydroxide etc.), nitrate (e.g., lithium nitrate (LiNO 3 ) etc.), or chloride (e.g., lithium chloride (LiCl) etc.), and any one thereof or a mixture of two or more thereof may be used.
  • a lithium-containing carbonate e.g., lithium carbonate etc.
  • hydrate e.g., lithium hydroxide monohydrate (LiOH ⁇ H 2 O) etc.
  • hydroxide e.g., lithium hydroxide etc.
  • nitrate e.g., lithium nitrate (LiNO 3 ) etc.
  • chloride e.g., lithium chloride (LiCl) etc.
  • the sintering temperature may be in a range of 700°C to 900°C, more preferably 750°C to 850°C, and most preferably 780°C to 820°C.
  • the sintering temperature is less than 700°C, since the raw materials may remain in the particles due to an insufficient reaction, the high-temperature stability of the battery may be reduced and the structural stability may be degraded due to reductions in bulk density and crystallinity, and, in a case in which the sintering temperature is greater than 900°C, non-uniform growth of the particles may occur.
  • the portion of the nickel (Ni) sites in the crystal structure of the lithium composite transition metal oxide thus prepared is substituted with tungsten (W), a rapid increase in the crystallite size may be prevented during sintering at high temperature even if a high amount of nickel (Ni) is particularly included.
  • the lithium composite transition metal oxide is prepared as described above, the lithium composite transition metal oxide is washed to remove a lithium byproduct, particularly, a lithium tungsten oxide remaining on the surface of the lithium composite transition metal oxide.
  • the washing for example, may be performed by a method in which the lithium composite transition metal oxide is added to pure water and stirred.
  • the washing may be performed by using the pure water in an amount of 50 parts by weight to 100 parts by weight based on 100 parts by weight of the lithium composite transition metal oxide.
  • the amount of the pure water is less than 50 parts by weight based on 100 parts by weight of the lithium composite transition metal oxide during the washing, since the washing is insufficient, the removal of the lithium byproduct may be insufficient, and, in a case in which the amount of the pure water is greater than 100 parts by weight, an amount of lithium in the crystal structure, which is dissolved in the water, may be increased.
  • the lithium composite transition metal oxide having a high concentration of nickel in which the amount of the nickel is 80 mol% or more since the amount of the lithium in the crystal structure, which is dissolved in the water, is significantly increased when the amount of the pure water is excessively high, the capacity and lifetime of the battery may be rapidly reduced.
  • washing temperature may be 30°C or less, for example, -10°C to 30°C
  • washing time may be in a range of about 10 minutes to about 1 hour.
  • the lithium composite transition metal oxide positive electrode active material thus prepared according to the embodiment of the present invention may contain tungsten (W) in an amount of 10 ppm to 5,000 ppm in the crystal structure, and the amount of the lithium tungsten oxide remaining on the particle surfaces is allowed to be 1,000 ppm or less, high capacity may be achieved, resistance may be improved, and life characteristics and high-temperature stability may be secured.
  • W tungsten
  • a positive electrode including the above-described positive electrode active material.
  • the positive electrode includes a positive electrode collector and a positive electrode active material layer which is disposed on at least one surface of the positive electrode collector and includes the above-described positive electrode active material.
  • the positive electrode collector is not particularly limited as long as it has conductivity without causing adverse chemical changes in the battery, and, for example, stainless steel, aluminum, nickel, titanium, fired carbon, or aluminum or stainless steel that is surface-treated with one of carbon, nickel, titanium, silver, or the like may be used. Also, the positive electrode collector may typically have a thickness of 3 ⁇ m to 500 ⁇ m, and microscopic irregularities may be formed on the surface of the collector to improve the adhesion of the positive electrode active material.
  • the positive electrode collector for example, may be used in various shapes such as that of a film, a sheet, a foil, a net, a porous body, a foam body, a non-woven fabric body, and the like.
  • the positive electrode active material layer may include a conductive agent and a binder in addition to the above-described positive electrode active material.
  • the positive electrode active material may be included in an amount of 80 wt% to 99 wt%, for example, 85 wt% to 98 wt% based on a total weight of the positive electrode active material layer.
  • the positive electrode active material is included in an amount within the above range, excellent capacity characteristics may be obtained.
  • the conductive agent is used to provide conductivity to the electrode, wherein any conductive agent may be used without particular limitation as long as it has suitable electron conductivity without causing adverse chemical changes in the battery.
  • the conductive agent may be graphite such as natural graphite or artificial graphite; carbon based materials such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, thermal black, and carbon fibers; powder or fibers of metal such as copper, nickel, aluminum, and silver; conductive whiskers such as zinc oxide whiskers and potassium titanate whiskers; conductive metal oxides such as titanium oxide; or conductive polymers such as polyphenylene derivatives, and any one thereof or a mixture of two or more thereof may be used.
  • the conductive agent may be typically included in an amount of 1 wt% to 30 wt% based on the total weight of the positive electrode active material layer.
  • the binder improves the adhesion between the positive electrode active material particles and the adhesion between the positive electrode active material and the current collector.
  • the binder may be polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-co-HFP), polyvinyl alcohol, polyacrylonitrile, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, an ethylene-propylene-diene monomer (EPDM), a sulfonated EPDM, a styrene-butadiene rubber (SBR), a fluorine rubber, or various copolymers thereof, and any one thereof or a mixture of two or more thereof may be used.
  • the binder may be included in an amount of 1 wt% to 30 wt% based on
  • the positive electrode may be prepared according to a typical method of preparing a positive electrode except that the above-described positive electrode active material is used. Specifically, a composition for forming a positive electrode active material layer, which is prepared by dissolving or dispersing the positive electrode active material as well as selectively the binder and the conductive agent in a solvent, is coated on the positive electrode collector, and the positive electrode may then be prepared by drying and rolling the coated positive electrode collector. In this case, types and amounts of the positive electrode active material, the binder, and the conductive are the same as those previously described.
  • the solvent may be a solvent normally used in the art.
  • the solvent may include dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, or water, and any one thereof or a mixture of two or more thereof may be used.
  • An amount of the solvent used may be sufficient if the solvent may dissolve or disperse the positive electrode active material, the conductive agent, and the binder in consideration of a coating thickness of a slurry and manufacturing yield, and may allow to have a viscosity that may provide excellent thickness uniformity during the subsequent coating for the preparation of the positive electrode.
  • the positive electrode may be prepared by casting the composition for forming a positive electrode active material layer on a separate support and then laminating a film separated from the support on the positive electrode collector.
  • an electrochemical device including the positive electrode is provided.
  • the electrochemical device may specifically be a battery or a capacitor, and, for example, may be a lithium secondary battery.
  • the lithium secondary battery specifically includes a positive electrode, a negative electrode disposed to face the positive electrode, a separator disposed between the positive electrode and the negative electrode, and an electrolyte, wherein the positive electrode is as described above. Also, the lithium secondary battery may further selectively include a battery container accommodating an electrode assembly of the positive electrode, the negative electrode, and the separator, and a sealing member sealing the battery container.
  • the negative electrode includes a negative electrode collector and a negative electrode active material layer disposed on the negative electrode collector.
  • the negative electrode collector is not particularly limited as long as it has high conductivity without causing adverse chemical changes in the battery, and, for example, copper, stainless steel, aluminum, nickel, titanium, fired carbon, copper or stainless steel that is surface-treated with one of carbon, nickel, titanium, silver, or the like, and an aluminum-cadmium alloy may be used.
  • the negative electrode collector may typically have a thickness of 3 ⁇ m to 500 ⁇ m, and, similar to the positive electrode collector, microscopic irregularities may be formed on the surface of the collector to improve the adhesion of a negative electrode active material.
  • the negative electrode collector for example, may be used in various shapes such as that of a film, a sheet, a foil, a net, a porous body, a foam body, a non-woven fabric body, and the like.
  • the negative electrode active material layer selectively includes a binder and a conductive agent in addition to the negative electrode active material.
  • a compound capable of reversibly intercalating and deintercalating lithium may be used as the negative electrode active material.
  • the negative electrode active material may be a carbonaceous material such as artificial graphite, natural graphite, graphitized carbon fibers, and amorphous carbon; a metallic compound alloyable with lithium such as silicon (Si), aluminum (Al), tin (Sn), lead (Pb), zinc (Zn), bismuth (Bi), indium (In), magnesium (Mg), gallium (Ga), cadmium (Cd), a Si alloy, a Sn alloy, or an Al alloy; a metal oxide which may be doped and undoped with lithium such as SiO ⁇ (0 ⁇ ⁇ ⁇ 2), SnO 2 , vanadium oxide, and lithium vanadium oxide; or a composite including the metallic compound and the carbonaceous material such as a SiC composite or a Sn-C composite, and any one thereof or a mixture of two or more thereof may be used.
  • a metallic lithium thin film may be used as the negative electrode active material.
  • both low crystalline carbon and high crystalline carbon may be used as the carbon material.
  • Typical examples of the low crystalline carbon may be soft carbon and hard carbon
  • typical examples of the high crystalline carbon may be irregular, planar, flaky, spherical, or fibrous natural graphite or artificial graphite, Kish graphite, pyrolytic carbon, mesophase pitch-based carbon fibers, meso-carbon microbeads, mesophase pitches, and high-temperature sintered carbon such as petroleum or coal tar pitch derived cokes.
  • the binder and the conductive agent may be the same as those previously described in the positive electrode.
  • the negative electrode active material layer may be prepared by coating a composition for forming a negative electrode, which is prepared by dissolving or dispersing selectively the binder and the conductive agent as well as the negative electrode active material in a solvent, on the negative electrode collector and drying the coated negative electrode collector, or may be prepared by casting the composition for forming a negative electrode on a separate support and then laminating a film separated from the support on the negative electrode collector.
  • the separator separates the negative electrode and the positive electrode and provides a movement path of lithium ions
  • any separator may be used as the separator without particular limitation as long as it is typically used in a lithium secondary battery, and particularly, a separator having high moisture-retention ability for an electrolyte as well as low resistance to the transfer of electrolyte ions may be used.
  • a porous polymer film for example, a porous polymer film prepared from a polyolefin-based polymer, such as an ethylene homopolymer, a propylene homopolymer, an ethylene/butene copolymer, an ethylene/hexene copolymer, and an ethylene/methacrylate copolymer, or a laminated structure having two or more layers thereof may be used.
  • a typical porous nonwoven fabric for example, a nonwoven fabric formed of high melting point glass fibers or polyethylene terephthalate fibers may be used.
  • a coated separator including a ceramic component or a polymer material may be used to secure heat resistance or mechanical strength, and the separator having a single layer or multilayer structure may be selectively used.
  • the electrolyte used in the present invention may include an organic liquid electrolyte, an inorganic liquid electrolyte, a solid polymer electrolyte, a gel-type polymer electrolyte, a solid inorganic electrolyte, or a molten-type inorganic electrolyte which may be used in the preparation of the lithium secondary battery, but the present invention is not limited thereto.
  • the electrolyte may include an organic solvent and a lithium salt.
  • any organic solvent may be used as the organic solvent without particular limitation so long as it may function as a medium through which ions involved in an electrochemical reaction of the battery may move.
  • an ester-based solvent such as methyl acetate, ethyl acetate, ⁇ -butyrolactone, and ⁇ -caprolactone
  • an ether-based solvent such as dibutyl ether or tetrahydrofuran
  • a ketone-based solvent such as cyclohexanone
  • an aromatic hydrocarbon-based solvent such as benzene and fluorobenzene
  • a carbonate-based solvent such as dimethyl carbonate (DMC), diethyl carbonate (DEC), methylethyl carbonate (MEC), ethylmethyl carbonate (EMC), ethylene carbonate (EC), and propylene carbonate (PC)
  • an alcohol-based solvent such as ethyl alcohol and isopropyl alcohol
  • nitriles such as R-CN (where R is
  • the carbonate-based solvent may be used, and, for example, a mixture of a cyclic carbonate (e.g., ethylene carbonate or propylene carbonate) having high ionic conductivity and high dielectric constant, which may increase charge/discharge performance of the battery, and a low-viscosity linear carbonate-based compound (e.g., ethylmethyl carbonate, dimethyl carbonate, or diethyl carbonate) may be used.
  • a cyclic carbonate e.g., ethylene carbonate or propylene carbonate
  • a low-viscosity linear carbonate-based compound e.g., ethylmethyl carbonate, dimethyl carbonate, or diethyl carbonate
  • the performance of the electrolyte solution may be excellent when the cyclic carbonate and the chain carbonate are mixed in a volume ratio of about 1:1 to about 1:9.
  • the lithium salt may be used without particular limitation as long as it is a compound capable of providing lithium ions used in the lithium secondary battery. Specifically, LiPF 6 , LiClO 4 , LiAsF 6 , LiBF 4 , LiSbF 6 , LiAlO 4 , LiAlCl 4 , LiCF 3 SO 3 , LiC 4 F 9 SO 3 , LiN(C 2 F 5 SO 3 ) 2 , LiN(C 2 F 5 SO 2 ) 2 , LiN(CF 3 SO 2 ) 2 , LiCl, LiI, or LiB(C 2 O 4 ) 2 may be used as the lithium salt.
  • the lithium salt may be used in a concentration range of 0.1 M to 2.0 M. In a case in which the concentration of the lithium salt is included within the above range, since the electrolyte may have appropriate conductivity and viscosity, excellent performance of the electrolyte may be obtained and lithium ions may effectively move.
  • At least one additive for example, a halo-alkylene carbonate-based compound such as difluoroethylene carbonate, pyridine, triethylphosphite, triethanolamine, cyclic ether, ethylenediamine, n-glyme, hexaphosphoric triamide, a nitrobenzene derivative, sulfur, a quinone imine dye, N-substituted oxazolidinone, N,N-substituted imidazolidine, ethylene glycol dialkyl ether, an ammonium salt, pyrrole, 2-methoxy ethanol, or aluminum trichloride, may be further added to the electrolyte in addition to the electrolyte components.
  • the additive may be included in an amount of 0.1 wt% to 5 wt% based on a total weight of the electrolyte.
  • the lithium secondary battery including the positive electrode active material according to the present invention stably exhibits excellent discharge capacity, output characteristics, and capacity retention
  • the lithium secondary battery is suitable for portable devices, such as mobile phones, notebook computers, and digital cameras, and electric cars such as hybrid electric vehicles (HEVs).
  • portable devices such as mobile phones, notebook computers, and digital cameras
  • electric cars such as hybrid electric vehicles (HEVs).
  • HEVs hybrid electric vehicles
  • a battery module including the lithium secondary battery as a unit cell and a battery pack including the battery module are provided.
  • the battery module or the battery pack may be used as a power source of at least one medium and large sized device of a power tool; electric cars including an electric vehicle (EV), a hybrid electric vehicle, and a plug-in hybrid electric vehicle (PHEV); or a power storage system.
  • electric cars including an electric vehicle (EV), a hybrid electric vehicle, and a plug-in hybrid electric vehicle (PHEV); or a power storage system.
  • EV electric vehicle
  • PHEV plug-in hybrid electric vehicle
  • a shape of the lithium secondary battery of the present invention is not particularly limited, but a cylindrical type using a can, a prismatic type, a pouch type, or a coin type may be used.
  • the lithium secondary battery according to the present invention may not only be used in a battery cell that is used as a power source of a small device, but may also be used as a unit cell in a medium and large sized battery module including a plurality of battery cells.
  • NiSO 4 , CoSO 4 , MnSO 4 , AlSO 4 and Na 2 WO 4 were mixed in water in amounts such that a molar ratio of nickel:cobalt:manganese:aluminum:tungsten was 85.857:9.995:1.999:1.999:0.15 to prepare a metal solution with a concentration of 2M.
  • a co-precipitation reaction was performed for 12 hours while respectively adding the metal solution, a NaOH aqueous solution, and a NH 4 OH aqueous solution at rates of 300 ml/min, 300 ml/min, and 60 ml/min to prepare a positive electrode active material precursor, Ni 0.85857 Co 0 . 09995 Mn 0.01999 W 0.0015 Al 0.01999 (OH) 2 .
  • Lithium hydroxide (LiOH) was mixed with the positive electrode active material precursor in a molar ratio of 1:1.02, and sintering was then performed at 800°C for about 10 hours to prepare a lithium composite transition metal oxide, Li(Ni 0.85857 Co 0.09995 Mn 0.01999 W 0.0015 Al 0.01999 )O 2 .
  • a positive electrode active material was prepared in the same manner as in Example 1 except that sintering was performed at 850°C.
  • NiSO 4 , CoSO 4 , MnSO 4 , and AlSO 4 were mixed in water in amounts such that a molar ratio of nickel:cobalt:manganese:aluminum was 86:10:2:2 to prepare a metal solution with a concentration of 2M.
  • a co-precipitation reaction was performed for 12 hours while respectively adding the metal solution, a NaOH aqueous solution, and a NH 4 OH aqueous solution at rates of 300 ml/min, 300 ml/min, and 60 ml/min to prepare a positive electrode active material precursor, Ni 0.86 Co 0.1 Mn 0.02 Al 0.02 (OH) 2 .
  • Lithium hydroxide (LiOH) was mixed with the positive electrode active material precursor in a molar ratio of 1:1.02, and sintering was then performed at 800°C for about 10 hours to prepare a lithium composite transition metal oxide, Li(Ni 0.86 Co 0.1 Mn 0.02 Al 0.02 )O 2 .
  • a positive electrode active material was prepared in the same manner as in Example 1 except that a lithium composite transition metal oxide, Li(Ni 0.85857 Co 0.09995 Mn 0.01999 W 0.0015 Al 0.01999 )O 2 , was prepared and washing was not performed.
  • a positive electrode active material precursor, Ni 0.86 Co 0.1 Mn 0.02 Al 0.02 (OH) 2 , and lithium hydroxide (LiOH) were mixed in a molar ratio of 1:1.02, Na 2 WO 4 was mixed at a molar ratio of 0.05 based on the amount of W, and sintering was then performed at 890°C for about 15 hours to prepare a positive electrode active material.
  • ICP inductively coupled plasma
  • lithium tungsten oxide (Li 2 WO 4 ) of each positive electrode active material prepared in Examples 1 and 2 and Comparative Examples 1 to 3 was measured and presented in Table 1 below.
  • crystallite size (c) and the particle diameter (d) were respectively measured using XRD and laser diffraction particle size measurement instrument (Mastersizer 3000 by Malvern Instruments, Ltd.), and the results thereof are presented in Table 1 below.
  • tungsten (W) was substituted into nickel (Ni) sites in a crystal structure in an amount of 2,000 ppm or more, and, with respect to Comparative Example 3 in which the tungsten (W) raw material was added as a doping material when sintering after mixing the positive electrode active material precursor and the lithium raw material, it may be understood that tungsten (W) was not substituted into the nickel (Ni) sites in the crystal structure, but was substituted into a surface side out of the crystal structure.
  • the positive electrode active materials of Examples 1 and 2 had a crystallite size of 200 nm or less, but, with respect to Comparative Examples 2 and 3, their crystallite sizes were significantly increased to greater than 200 nm, and thus, d/1,000 c was less than 0.05.
  • Each of the positive electrode active materials prepared in Examples 1 and 2 and Comparative Examples 1 to 3, a carbon black conductive agent, and a PVdF binder were mixed in an N-methylpyrrolidone solvent at a weight ratio of 95:2.5:2.5 to prepare a positive electrode material mixture (viscosity: 5,000 mPa ⁇ s), and one surface of an aluminum current collector was coated with the mixture, dried at 130°C, and then rolled to prepared a positive electrode.
  • a negative electrode active material natural graphite, a carbon black conductive agent, and a PVdF binder were mixed in an N-methylpyrrolidone solvent at a weight ratio of 85:10:5 to prepare a composition for forming a negative electrode active material layer, and one surface of a copper current collector was coated with the composition to prepared a negative electrode.
  • An electrode assembly was prepared by disposing a porous polyethylene separator between the positive electrode and the negative electrode prepared as described above, and each lithium secondary battery was prepared by disposing the electrode assembly in a case, and then injecting an electrolyte solution into the case.
  • Discharge capacities of the lithium secondary batteries thus prepared are presented in Table 2 below. [Table 2] Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Discharge capacity (mAh/g) 199 ⁇ 200 200 ⁇ 210 180 ⁇ 190 190 ⁇ 195 180 ⁇ 185

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US11495796B2 (en) 2018-11-14 2022-11-08 Samsung Sdi Co., Ltd. Positive active material for rechargeable lithium battery, method of preparing the same and rechargeable lithium battery including the same
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